Multiply fibre board containers



Dec- 1, 19 D. A. STONEBANKS MULTIPLYFIBREZBOARD CONTAINERS Filed Aug. 21. 1959 DA v/a ARTHUR STONEBA/VKS IN V EN TOR.

F/GZaZ United States Patent 3,159,326 MULTELY FIBRE BOA (CONTAINERS David Arthur Stonebanks, London, England, assignor to Continental Can Company, New York, N.Y., a corpo- The invention relates to fibre board containers and in particular, but not essentially, to such containers which are used for carrying relatively large quantities of powders, pellets, granular material or, in general, any materials which are not self-supporting. If a granular material is packed in a fibre board container there is a tendency for the sides of the containers to bulge and therefore it is desirable that they should be strengthened. Furthermore the sides of the containers should be strengthened to resist compression when containers are stacked one upon the other.

According to the present invention a multiply, fibre board container is provided with at least one of its walls reinforced by a surface layer thereof being bent to form a hollow rib.

The hollow rib may be strengthened by a reinforcement accommodated therein. The reinforcement may be made of extraneous material nested snugly in the hollow rib and the rib and said reinforcement may be of corresponding section e.g. rectangular. If desired, the reinforcement may extend continuously along the interior of the rib.

An adjacent ply of the wall may be bent to provide, within the hollow rib, a secondary rib constituting said reinforcement. In this instance the hollow rib may be of triangular section and the secondary rib may have contiguous bent portions extending to bear against the projecting apex of the hollow rib.

In a two-ply container, according to the present invention, an inner surface ply of a wall of the container may be bent to form the hollow rib. If desired more than one rib may be formed in the wall and any number of walls of the container may be reinforced.

The present invention is illustrated by way of example in the accompanying drawing, in which:

FIGURE 1 is a perspective view of a container with part of the walls thereof broken away.

FIGURES 2a, b, c and of show four alternative means of reinforcing a wall of a container.

A two-ply container of fibre board material has its side walls 1 reinforced by a hollow rib 2 projecting into the interior of the container. An inner surface ply 3 of each wall of the container is bent to form the rib 2, which is of triangular section and extends vertically up each side wall. An outer surface ply 4 of each side wall has contiguous bent portions 5 which extend to bear against the projecting apex 6 of each rib 2. The two plies 3 and 4 may be attached or unattached to each other and if attached, may be stitched together. The ends of the container are clased by top and bot-tom closure elements 7 and 8, formed with side flanges 9 which extend around the side walls 1 of the container.

The simplest form of hollow rib is illustrated in FIG- URE 2a and this comprises a rib 12 of triangular section formed by bending the inner surface ply 13 of a wall of a container- Any number of hollow ribs 12 may be provided depending upon the strength required in the side ice wall and an example of wall having three ribs is illustrated in FIGURE 20. An example of a wall having three hollow ribs of the construction illustrated in FIG- URE 1 is shown in FIGURE 2d. In an alternative construction shown in FIGURE 212 an inner surface layer 14 of a wall is bent to form a hollow rib 15 of rectangular section. This hollow rib 15 is reinforced by a member 16 of extraneous material, for example, a wooden strut, nested snugly in the rib and extended continuously therealong.

A container having side walls reinforced in a manner according to the present invention is particularly useful for the packaging of granular material as there is little or no tendency for said walls to bulge out and, furthermore, as the hollow ribs extend vertically up the side walls, containers may be stacked one upon another with little risk of collapse of the side walls.

Preferred and modified forms of the invention have been disclosed herein and it is to be understood that other variations in part arrangement may be resorted to without departing from the scope of the invention as defined in the appended claims.

I claim:

1. In a container, a body comprising a plurality of upstanding walls, certain of said walls being formed of inner and outer layers, said inner layer having an intermediate vertically extending hollow rib projecting inwardly from the general plane of said inner layer, said outer layer having an inwardly directed vertically extending reinforcing rib engaging and reinforcing said hollow rib of said inner layer, said hollow rib and said reinforcing rib combining to form a vertical reinforcing portion for the wall of which said layers are parts to resist outward bowing and vertical collapsing of the wall.

2. In a container, a body comprising a plurality of upstanding walls, certain of said walls being formed of inner and outer layers, said inner layer having an intermediate vertically extending portion inwardly ofiset from the general plane of said inner layer, said intermediate portion being narrow as compared to the extent of its respective wall and together with said outer layer forming a tubular reinforcing portion for the wall of which said layers are parts to resist outward bowing and vertical collapsing of the wall, and a reinforcing filler disposed within said tubular reinforcing portion.

3. The container construction of claim 1 wherein said inner layer hollow rib is generally V-shaped in cross section and has an apex, and said reinforcing rib is generally flat and engages said inner layer hollow rib at said apex.

4. In a paperboard container, a main body portion consisting of four upstanding walls, each of said walls being formed of an inner layer panel and an outer layer panel, the wall panels of each of said inner layers being joined to each other at substantially right angles through vertical fold lines at each of the four corners, said outerwall panels also being joined to each other at substantially right angles through fold lines at each of the four corners, each of said inner layer panels having a major portion thereof lying in a single plane with said portions being in face-to-face engagement with a major portion of each of said outer layer panels, each of said inner layer panels having a part thereof extending inwardly and in offset relation to the plane of the major portion of said inner layer panel from which it is offset, each of said offset portions being intermediate said inner layer panels and exv '1; I v tending the full height of said walls, each of said olfset portions being formed into a triangle, said tliangles each having an apex extended away from each of said outer layer panels, each of said inner layer panels having its vertical latenal edge in abutment, at its fold line connection, with each of the adjacent outer layer panels that are at substantially n'ght angles to the outer layer panel that is parallel to said inner layer panel.

NlTED STATES PATENTS Shelton June 15, 1915 Holbroolg May 6, 1930 Shofer 'M-ay 24, 1932 Zalkind "Aug. 17, 1943 R-ufiin Mar. 28, 1950 Mansfield Dec. 13, 1960 

1. IN A CONTAINER, A BODY COMPRISING A PLURALITY OF UPSTANDING WALLS, CERTAIN OF SAID WALLS BEING FORMED OF INNER AND OUTER LAYERS, SAID INNER LAYER HAVING AN INTERMEDIATE VERTICALLY EXTENDING HOLLOW RIB PROJECTING INWARDLY FROM THE GENERAL PLANE OF SAID INNER LAYER, SAID OUTER LAYER HAVING AN INWARDLY DIRECTED VERTICALLY EXTENDING REINFORCING RIB ENGAGING AND REINFORCING SAID HOLLOW RIB OF SAID INNER LAYER, SAID HOLLOW RIB AND SAID REINFORCING RIB COMBINING TO FORM A VERTICAL REINFORCING PORTION FOR THE 